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    <h1 class="post_title">ARM64 Crash调试环境搭建</h1>
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    <span class="post_date">
      2023/10/03</span>
    <span class="post_time"> | 5 分钟阅读</span><span>&nbsp;|<a href='https://kingdix10.gitee.io/tags/linux%E5%86%85%E6%A0%B8/' title="linux内核" class="post_tag button button_translucent">linux内核
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      <div class="post_toc">
        <h2>文章目录</h2>
        <nav id="TableOfContents">
  <ul>
    <li><a href="#1-arm64-crash调试环境搭建">1. ARM64 Crash调试环境搭建</a>
      <ul>
        <li><a href="#11-x86_64主机编译arm64-crash工具">1.1. x86_64主机编译ARM64 Crash工具</a></li>
        <li><a href="#12-x86_64主机使用docker安装arm64-crash工具">1.2. x86_64主机使用Docker安装ARM64 Crash工具</a></li>
      </ul>
    </li>
    <li><a href="#2-编译配置">2. 编译配置</a>
      <ul>
        <li><a href="#21-内核配置和编译">2.1. 内核配置和编译</a></li>
        <li><a href="#22-buildroot配置和编译">2.2. buildroot配置和编译</a></li>
      </ul>
    </li>
    <li><a href="#3-运行">3. 运行</a>
      <ul>
        <li><a href="#31-qemu启动kernel">3.1. qemu启动kernel</a></li>
        <li><a href="#32-kexec加载内核">3.2. kexec加载内核</a></li>
        <li><a href="#33-触发panic">3.3. 触发panic</a></li>
        <li><a href="#34-保存vmcore">3.4. 保存vmcore</a></li>
      </ul>
    </li>
    <li><a href="#4-crash调试">4. Crash调试</a></li>
  </ul>
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    <div class="post_body"><h1 id="1-arm64-crash调试环境搭建">1. ARM64 Crash调试环境搭建</h1>
<p>主要参考资料：</p>
<ul>
<li>内核源码 <code>Documentation/admin-guide/kdump/kdump.rst</code>或者<a href="https://www.kernel.org/doc/html/v6.6/admin-guide/kdump/kdump.html">Documentation for Kdump - The kexec-based Crash Dumping Solution</a></li>
<li>Crash白皮书：<a href="https://crash-utility.github.io/crash_whitepaper.html">https://crash-utility.github.io/crash_whitepaper.html</a></li>
<li>Crash github：<a href="https://github.com/crash-utility/crash">https://github.com/crash-utility/crash</a></li>
</ul>
<h2 id="11-x86_64主机编译arm64-crash工具">1.1. x86_64主机编译ARM64 Crash工具</h2>
<p>在x86机器上安装的Crash工具不能直接调试ARM64的coredump文件。可以通过重新编译Crash源码来生成调试ARM64 coredump文件的Crash。参考<a href="https://github.com/crash-utility/crash/tree/8.0.3">https://github.com/crash-utility/crash/tree/8.0.3</a>的README中提供的编译方法，解压代码后，执行 <code>make target=ARM64</code>即可。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="ln"> 1</span><span class="cl">  To build the crash utility:
</span></span><span class="line"><span class="ln"> 2</span><span class="cl">
</span></span><span class="line"><span class="ln"> 3</span><span class="cl">    $ tar -xf crash-8.0.3.tar.gz
</span></span><span class="line"><span class="ln"> 4</span><span class="cl">    $ cd crash-8.0.3
</span></span><span class="line"><span class="ln"> 5</span><span class="cl">    $ make
</span></span><span class="line"><span class="ln"> 6</span><span class="cl">
</span></span><span class="line"><span class="ln"> 7</span><span class="cl">  The initial build will take several minutes  because the embedded gdb module
</span></span><span class="line"><span class="ln"> 8</span><span class="cl">  must be configured and built.  Alternatively, the crash source RPM file
</span></span><span class="line"><span class="ln"> 9</span><span class="cl">  may be installed and built, and the resultant crash binary RPM file installed.
</span></span><span class="line"><span class="ln">10</span><span class="cl">
</span></span><span class="line"><span class="ln">11</span><span class="cl">  The crash binary can only be used on systems of the same architecture as
</span></span><span class="line"><span class="ln">12</span><span class="cl">  the host build system.  There are a few optional manners of building the
</span></span><span class="line"><span class="ln">13</span><span class="cl">  crash binary:
</span></span><span class="line"><span class="ln">14</span><span class="cl">
</span></span><span class="line"><span class="ln">15</span><span class="cl">  o  On an x86_64 host, a 32-bit x86 binary that can be used to analyze
</span></span><span class="line"><span class="ln">16</span><span class="cl">     32-bit x86 dumpfiles may be built by typing &#34;make target=X86&#34;.
</span></span><span class="line"><span class="ln">17</span><span class="cl">  o  On an x86 or x86_64 host, a 32-bit x86 binary that can be used to analyze
</span></span><span class="line"><span class="ln">18</span><span class="cl">     32-bit arm dumpfiles may be built by typing &#34;make target=ARM&#34;.
</span></span><span class="line"><span class="ln">19</span><span class="cl">  o  On an x86 or x86_64 host, a 32-bit x86 binary that can be used to analyze
</span></span><span class="line"><span class="ln">20</span><span class="cl">     32-bit mips dumpfiles may be built by typing &#34;make target=MIPS&#34;.
</span></span><span class="line"><span class="ln">21</span><span class="cl">  o  On an ppc64 host, a 32-bit ppc binary that can be used to analyze
</span></span><span class="line"><span class="ln">22</span><span class="cl">     32-bit ppc dumpfiles may be built by typing &#34;make target=PPC&#34;.
</span></span><span class="line"><span class="ln">23</span><span class="cl">  o  On an x86_64 host, an x86_64 binary that can be used to analyze
</span></span><span class="line"><span class="ln">24</span><span class="cl">     arm64 dumpfiles may be built by typing &#34;make target=ARM64&#34;.
</span></span><span class="line"><span class="ln">25</span><span class="cl">  o  On an x86_64 host, an x86_64 binary that can be used to analyze
</span></span><span class="line"><span class="ln">26</span><span class="cl">     ppc64le dumpfiles may be built by typing &#34;make target=PPC64&#34;.
</span></span><span class="line"><span class="ln">27</span><span class="cl">  o  On an x86_64 host, an x86_64 binary that can be used to analyze
</span></span><span class="line"><span class="ln">28</span><span class="cl">     riscv64 dumpfiles may be built by typing &#34;make target=RISCV64&#34;.
</span></span></code></pre></div><h2 id="12-x86_64主机使用docker安装arm64-crash工具">1.2. x86_64主机使用Docker安装ARM64 Crash工具</h2>
<p>编译安装的方法需要自己解决依赖，编译也相对耗时，这里使用Docker来解决。后续也使用这种方式来介绍。</p>
<p>Docker的安装可以参考清华大学开源软件镜像站<a href="https://mirrors.tuna.tsinghua.edu.cn/help/docker-ce/">Docker CE 软件仓库镜像使用帮助</a>，之后可以直接使用，也可以参考其他资料配置国内加速源。安装Docker后按如下步骤执行。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl"><span class="c1"># 安装ARM64的运行支持</span>
</span></span><span class="line"><span class="ln">2</span><span class="cl">sudo apt-get install qemu-user-static binfmt-support
</span></span><span class="line"><span class="ln">3</span><span class="cl"><span class="c1"># 拉取arm64v8的debian镜像</span>
</span></span><span class="line"><span class="ln">4</span><span class="cl">docker pull arm64v8/debian:bookworm-20230814
</span></span><span class="line"><span class="ln">5</span><span class="cl"><span class="c1"># 启动docker容器，并挂载宿主机目录，Crash调试时需要vmlinux文件</span>
</span></span><span class="line"><span class="ln">6</span><span class="cl">docker run  -it --privileged -v /storage/data:/data arm64v8/debian:bookworm-20230814 bash
</span></span></code></pre></div><p>启动docker容器，可以安装Crash工具和辅助工具。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl">apt install crash vim less
</span></span></code></pre></div><p>安装完成后，可以在宿主机使用 <code>docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]</code>将容器保存为镜像，之后可以在宿主机上使用镜像启动容器。</p>
<p>docker容器内使用 <code>crash  --buildinfo</code>可以查看Crash工具支持的架构，这里提示 <code>build_target</code>是ARM64。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl">crash   --buildinfo
</span></span><span class="line"><span class="ln">2</span><span class="cl">   build_command: crash
</span></span><span class="line"><span class="ln">3</span><span class="cl">      build_data: reproducible build
</span></span><span class="line"><span class="ln">4</span><span class="cl">    build_target: ARM64
</span></span><span class="line"><span class="ln">5</span><span class="cl">   build_version: 8.0.2
</span></span><span class="line"><span class="ln">6</span><span class="cl">compiler version: gcc <span class="o">(</span>Debian 12.2.0-9<span class="o">)</span> 12.2.0
</span></span></code></pre></div><h1 id="2-编译配置">2. 编译配置</h1>
<p>这里不过多介绍编译的细节，只介绍编译所需要的配置。</p>
<h2 id="21-内核配置和编译">2.1. 内核配置和编译</h2>
<p>ARM64的内核编译需要打开如下宏，文档中没有提到 <code>CONFIG_RANDOMIZE_BASE</code>和 <code>CONFIG_PROC_KCORE</code>，但也是需要的，而且传递到内核的cmdline不能有nokaslr。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-mk" data-lang="mk"><span class="line"><span class="ln">1</span><span class="cl"><span class="nv">CONFIG_KEXEC</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">2</span><span class="cl"><span class="nv">CONFIG_SYSFS</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">3</span><span class="cl"><span class="nv">CONFIG_DEBUG_INFO</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">4</span><span class="cl"><span class="nv">CONFIG_RELOCATABLE</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">5</span><span class="cl"><span class="nv">CONFIG_RANDOMIZE_BASE</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">6</span><span class="cl"><span class="nv">CONFIG_CRASH_DUMP</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">7</span><span class="cl"><span class="nv">CONFIG_PROC_KCORE</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">8</span><span class="cl"><span class="nv">CONFIG_PROC_VMCORE</span><span class="o">=</span>y
</span></span></code></pre></div><p>为了可以使用sysrq触发panic，还需要开启如下几个选项。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-mk" data-lang="mk"><span class="line"><span class="ln">1</span><span class="cl"><span class="nv">CONFIG_MAGIC_SYSRQ</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">2</span><span class="cl"><span class="nv">CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE</span><span class="o">=</span>0x1
</span></span><span class="line"><span class="ln">3</span><span class="cl"><span class="nv">CONFIG_MAGIC_SYSRQ_SERIAL</span><span class="o">=</span>y
</span></span></code></pre></div><h2 id="22-buildroot配置和编译">2.2. buildroot配置和编译</h2>
<p>使能kexec工具。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-mk" data-lang="mk"><span class="line"><span class="ln">1</span><span class="cl"><span class="nv">BR2_PACKAGE_KEXEC</span><span class="o">=</span>y
</span></span><span class="line"><span class="ln">2</span><span class="cl"><span class="nv">BR2_PACKAGE_KEXEC_ZLIB</span><span class="o">=</span>y
</span></span></code></pre></div><h1 id="3-运行">3. 运行</h1>
<h2 id="31-qemu启动kernel">3.1. qemu启动kernel</h2>
<p>qemu启动内核的命令如下，可以根据自己需要修改。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl">qemu-system-aarch64 -nographic  -cpu cortex-a57 -M <span class="nv">type</span><span class="o">=</span>virt,mte<span class="o">=</span>off,virtualization<span class="o">=</span>false,gic-version<span class="o">=</span><span class="m">3</span> -semihosting -semihosting-config <span class="nv">enable</span><span class="o">=</span>on,target<span class="o">=</span>native -smp <span class="m">2</span> -m <span class="m">1024</span> -netdev user,id<span class="o">=</span>net0 -device virtio-net-device,netdev<span class="o">=</span>net0 -object rng-random,filename<span class="o">=</span>/dev/urandom,id<span class="o">=</span>rng0 -device virtio-rng-pci,rng<span class="o">=</span>rng0,max-bytes<span class="o">=</span>1024,period<span class="o">=</span><span class="m">1000</span> <span class="se">\
</span></span></span><span class="line"><span class="ln">2</span><span class="cl"><span class="se"></span>	-kernel /data/eel/images/arm64/kernel/linux-6.6/arm64_debug_defconfig/arch/arm64/boot/Image -drive <span class="k">if</span><span class="o">=</span>none,format<span class="o">=</span>raw,file<span class="o">=</span>/data/eel/images/arm64/rootfs/buildroot-2023.02/mine_arm64_defconfig/images/rootfs.ext4,id<span class="o">=</span>hd0 -device virtio-blk-device,drive<span class="o">=</span>hd0 <span class="se">\
</span></span></span><span class="line"><span class="ln">3</span><span class="cl"><span class="se"></span>	-append <span class="s2">&#34;console=ttyAMA0 crashkernel=512M-1G:64M,1G-:128M loglevel=6 initcall_debug no_console_suspend root=/dev/vda rw init=/linuxrc&#34;</span> <span class="se">\
</span></span></span><span class="line"><span class="ln">4</span><span class="cl"><span class="se"></span>	-fsdev local,id<span class="o">=</span>share_comm,path<span class="o">=</span>/data/eel/share,security_model<span class="o">=</span>none -device virtio-9p-device,fsdev<span class="o">=</span>share_comm,mount_tag<span class="o">=</span>mnt_comm -fsdev local,id<span class="o">=</span>share_arch,path<span class="o">=</span>/data/eel/images/arm64,security_model<span class="o">=</span>none -device virtio-9p-device,fsdev<span class="o">=</span>share_arch,mount_tag<span class="o">=</span>mnt_arch -fsdev local,id<span class="o">=</span>share_eel,path<span class="o">=</span>/data/eel,security_model<span class="o">=</span>passthrough,readonly<span class="o">=</span>on -device virtio-9p-device,fsdev<span class="o">=</span>share_eel,mount_tag<span class="o">=</span>mnt_eel
</span></span></code></pre></div><p>这里要注意cmdline参数不能带有nokaslr。cmdline要添加crashkernel，表示为crashkernel预留的内存。</p>
<ul>
<li>crashkernel=64M：为crashkernel预留64M内存。</li>
<li>crashkernel=512M-1G:64M,1G-:128M：当系统总内存在512M-1G，预留64M，当系统总内存大于1G，预留128M。</li>
</ul>
<p>另外需要将宿主机的目录映射到qemu内，以便qemu内可以读取编译生成的kernel Image文件，也可以把产生的vmcore文件导出到host。这里映射了3个目录，其中第一个是 <code>-fsdev local,id=share_comm,path=/data/eel/share,security_model=none -device virtio-9p-device,fsdev=share_comm,mount_tag=mnt_comm</code>。qemu内，可以通 <code>过mount -t 9p share_comm /mnt</code>来挂载。</p>
<h2 id="32-kexec加载内核">3.2. kexec加载内核</h2>
<p>qemu启动linux后，需要用kexec加载crashkernel，注意 <code>maxcpus=1 reset_devices</code>是必须的。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl">kexec <span class="se">\
</span></span></span><span class="line"><span class="ln">2</span><span class="cl"><span class="se"></span>    --append<span class="o">=</span><span class="s2">&#34;console=ttyAMA0 rootfstype=ext4 rootwait root=/dev/vda rw maxcpus=1 reset_devices&#34;</span> <span class="se">\
</span></span></span><span class="line"><span class="ln">3</span><span class="cl"><span class="se"></span>    -p /data/eel/images/arm64/kernel/linux-6.6/arm64_debug_defconfig/arch/arm64/boot/Image
</span></span></code></pre></div><p>上述命令如果没有输出，则表示执行成功。想要看到详细的信息，可以加上 <code>-d</code>选项。</p>
<h2 id="33-触发panic">3.3. 触发panic</h2>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl"><span class="nb">echo</span> c &gt; /proc/sysrq-trigger
</span></span></code></pre></div><p>重启时的日志，可以看到panic后，自动启动新的内核。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="ln"> 1</span><span class="cl"># echo c &gt; /proc/sysrq-trigger
</span></span><span class="line"><span class="ln"> 2</span><span class="cl">[  374.873622][  T160] sysrq: Trigger a crash
</span></span><span class="line"><span class="ln"> 3</span><span class="cl">[  374.874185][  T160] Kernel panic - not syncing: sysrq triggered crash
</span></span><span class="line"><span class="ln"> 4</span><span class="cl">[  374.874602][  T160] CPU: 0 PID: 160 Comm: sh Kdump: loaded Not tainted 6.6.0-g3149bc21d316-dirty #2 1c048aede95eceae4e303b1d563e246e55cb9a9d
</span></span><span class="line"><span class="ln"> 5</span><span class="cl">[  374.875175][  T160] Hardware name: linux,dummy-virt (DT)
</span></span><span class="line"><span class="ln"> 6</span><span class="cl">[  374.875392][  T160] Call trace:
</span></span><span class="line"><span class="ln"> 7</span><span class="cl">[  374.875474][  T160]  dump_backtrace+0x104/0x130
</span></span><span class="line"><span class="ln"> 8</span><span class="cl">[  374.875674][  T160]  show_stack+0x20/0x50
</span></span><span class="line"><span class="ln"> 9</span><span class="cl">[  374.875723][  T160]  dump_stack_lvl+0x90/0xbc
</span></span><span class="line"><span class="ln">10</span><span class="cl">[  374.875847][  T160]  dump_stack+0x18/0x34
</span></span><span class="line"><span class="ln">11</span><span class="cl">[  374.875972][  T160]  panic+0x1a0/0x38c
</span></span><span class="line"><span class="ln">12</span><span class="cl">[  374.876039][  T160]  sysrq_handle_crash+0x24/0x2c
</span></span><span class="line"><span class="ln">13</span><span class="cl">[  374.876173][  T160]  __handle_sysrq+0xdc/0x1a4
</span></span><span class="line"><span class="ln">14</span><span class="cl">[  374.876231][  T160]  write_sysrq_trigger+0x78/0xa0
</span></span><span class="line"><span class="ln">15</span><span class="cl">[  374.876418][  T160]  proc_reg_write+0xc8/0x100
</span></span><span class="line"><span class="ln">16</span><span class="cl">[  374.876546][  T160]  vfs_write+0x168/0x330
</span></span><span class="line"><span class="ln">17</span><span class="cl">[  374.876724][  T160]  ksys_write+0x70/0xfc
</span></span><span class="line"><span class="ln">18</span><span class="cl">[  374.876906][  T160]  __arm64_sys_write+0x24/0x30
</span></span><span class="line"><span class="ln">19</span><span class="cl">[  374.877146][  T160]  el0_svc_common.constprop.0+0xfc/0x1f4
</span></span><span class="line"><span class="ln">20</span><span class="cl">[  374.877254][  T160]  do_el0_svc+0xb4/0xc0
</span></span><span class="line"><span class="ln">21</span><span class="cl">[  374.877339][  T160]  el0_svc+0x48/0xa0
</span></span><span class="line"><span class="ln">22</span><span class="cl">[  374.877420][  T160]  el0t_64_sync_handler+0xc8/0x14c
</span></span><span class="line"><span class="ln">23</span><span class="cl">[  374.877642][  T160]  el0t_64_sync+0x19c/0x1a0
</span></span><span class="line"><span class="ln">24</span><span class="cl">[  374.878124][  T160] SMP: stopping secondary CPUs
</span></span><span class="line"><span class="ln">25</span><span class="cl">[  374.878981][  T160] Starting crashdump kernel...
</span></span><span class="line"><span class="ln">26</span><span class="cl">[  374.879230][  T160] Bye!
</span></span><span class="line"><span class="ln">27</span><span class="cl">[    0.000000][    T0] Booting Linux on physical CPU 0x0000000000 [0x411fd070]
</span></span><span class="line"><span class="ln">28</span><span class="cl">[    0.000000][    T0] Linux version 6.6.0-g3149bc21d316-dirty (dix@EEL) (aarch64-linux-gnu-gcc (GCC) 11.3.1 20220604 [releases/gcc-11 revision 591c0f4b92548e3ae2e8173f4f93984b1c7f62bb], GNU ld (Linaro_Binutils-2022.06) 2.37.20220122) #2 SMP PREEMPT Tue Sep 19 01:09:13 CST 2023
</span></span><span class="line"><span class="ln">29</span><span class="cl">[    0.000000][    T0] Machine model: linux,dummy-virt
</span></span><span class="line"><span class="ln">30</span><span class="cl">[    0.000000][    T0] efi: UEFI not found.
</span></span><span class="line"><span class="ln">31</span><span class="cl">[    0.000000][    T0] OF: fdt: Reserving 1 KiB of memory at 0x7ebff000 for elfcorehdr
</span></span></code></pre></div><p>新的内核是用kexec加载好的内核，如果用<code>cat /proc/cpuinfo</code>查看的话，会显示只有一个核。</p>
<h2 id="34-保存vmcore">3.4. 保存vmcore</h2>
<p>panic重启后生成的文件在 <code>/proc/vmcore</code>，正常启动则没有这个文件。将vmcore保存到与宿主机共享的目录</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl">cat /proc/vmcore &gt; /mnt/vmcore_arm64_6.6
</span></span></code></pre></div><h1 id="4-crash调试">4. Crash调试</h1>
<p>进入ARM64 Docker使用Crash工具分析</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl">crash vmcore_arm64_6.6  /data/eel/output/arm64/kernel/linux-6.6/arm64_debug_defconfig/vmlinux
</span></span></code></pre></div><p>加载需要一点时间，完成后会显示如下信息。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln"> 1</span><span class="cl">      KERNEL: /data/eel/output/arm64/kernel/linux-6.6/arm64_debug_defconfig/vmlinux
</span></span><span class="line"><span class="ln"> 2</span><span class="cl">    DUMPFILE: vmcore_arm64_6.6
</span></span><span class="line"><span class="ln"> 3</span><span class="cl">        CPUS: <span class="m">2</span>
</span></span><span class="line"><span class="ln"> 4</span><span class="cl">        DATE: Sat Sep <span class="m">23</span> 09:47:30 CST <span class="m">2023</span>
</span></span><span class="line"><span class="ln"> 5</span><span class="cl">      UPTIME: 00:06:14
</span></span><span class="line"><span class="ln"> 6</span><span class="cl">LOAD AVERAGE: 0.00, 0.00, 0.00
</span></span><span class="line"><span class="ln"> 7</span><span class="cl">       TASKS: <span class="m">60</span>
</span></span><span class="line"><span class="ln"> 8</span><span class="cl">    NODENAME: buildroot
</span></span><span class="line"><span class="ln"> 9</span><span class="cl">     RELEASE: 6.6.0-g3149bc21d316-dirty
</span></span><span class="line"><span class="ln">10</span><span class="cl">     VERSION: <span class="c1">#2 SMP PREEMPT Tue Sep 19 01:09:13 CST 2023</span>
</span></span><span class="line"><span class="ln">11</span><span class="cl">     MACHINE: aarch64  <span class="o">(</span>unknown Mhz<span class="o">)</span>
</span></span><span class="line"><span class="ln">12</span><span class="cl">      MEMORY: <span class="m">1</span> GB
</span></span><span class="line"><span class="ln">13</span><span class="cl">       PANIC: <span class="s2">&#34;Kernel panic - not syncing: sysrq triggered crash&#34;</span>
</span></span><span class="line"><span class="ln">14</span><span class="cl">         PID: <span class="m">160</span>
</span></span><span class="line"><span class="ln">15</span><span class="cl">     COMMAND: <span class="s2">&#34;sh&#34;</span>
</span></span><span class="line"><span class="ln">16</span><span class="cl">        TASK: ffff65a602b68ec0  <span class="o">[</span>THREAD_INFO: ffff65a602b68ec0<span class="o">]</span>
</span></span><span class="line"><span class="ln">17</span><span class="cl">         CPU: <span class="m">0</span>
</span></span><span class="line"><span class="ln">18</span><span class="cl">       STATE: TASK_RUNNING <span class="o">(</span>PANIC<span class="o">)</span>
</span></span></code></pre></div><p>这里先简单使用 <code>bt</code>来看一下panic时的调用栈，可以看到是sysrq触发了panic。</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln"> 1</span><span class="cl">crash&gt; bt
</span></span><span class="line"><span class="ln"> 2</span><span class="cl">PID: <span class="m">160</span>      TASK: ffff65a602b68ec0  CPU: <span class="m">0</span>    COMMAND: <span class="s2">&#34;sh&#34;</span>
</span></span><span class="line"><span class="ln"> 3</span><span class="cl"> <span class="c1">#0 [ffff800008413a10] machine_kexec at ffffd6678e834e98</span>
</span></span><span class="line"><span class="ln"> 4</span><span class="cl"> <span class="c1">#1 [ffff800008413a40] __crash_kexec at ffffd6678e9148bc</span>
</span></span><span class="line"><span class="ln"> 5</span><span class="cl"> <span class="c1">#2 [ffff800008413bd0] panic at ffffd6678f4f6a34</span>
</span></span><span class="line"><span class="ln"> 6</span><span class="cl"> <span class="c1">#3 [ffff800008413cb0] sysrq_handle_crash at ffffd6678eee25f4</span>
</span></span><span class="line"><span class="ln"> 7</span><span class="cl"> <span class="c1">#4 [ffff800008413cc0] __handle_sysrq at ffffd6678eee2e58</span>
</span></span><span class="line"><span class="ln"> 8</span><span class="cl"> <span class="c1">#5 [ffff800008413d10] write_sysrq_trigger at ffffd6678eee34b4</span>
</span></span><span class="line"><span class="ln"> 9</span><span class="cl"> <span class="c1">#6 [ffff800008413d30] proc_reg_write at ffffd6678eb88714</span>
</span></span><span class="line"><span class="ln">10</span><span class="cl"> <span class="c1">#7 [ffff800008413d50] vfs_write at ffffd6678eaf3c24</span>
</span></span><span class="line"><span class="ln">11</span><span class="cl"> <span class="c1">#8 [ffff800008413df0] ksys_write at ffffd6678eaf3f80</span>
</span></span><span class="line"><span class="ln">12</span><span class="cl"> <span class="c1">#9 [ffff800008413e30] __arm64_sys_write at ffffd6678eaf4030</span>
</span></span><span class="line"><span class="ln">13</span><span class="cl"><span class="c1">#10 [ffff800008413e40] el0_svc_common.constprop.0 at ffffd6678e829528</span>
</span></span><span class="line"><span class="ln">14</span><span class="cl"><span class="c1">#11 [ffff800008413e70] do_el0_svc at ffffd6678e8296d4</span>
</span></span><span class="line"><span class="ln">15</span><span class="cl"><span class="c1">#12 [ffff800008413e80] el0_svc at ffffd6678f5085c4</span>
</span></span><span class="line"><span class="ln">16</span><span class="cl"><span class="c1">#13 [ffff800008413ea0] el0t_64_sync_handler at ffffd6678f509948</span>
</span></span><span class="line"><span class="ln">17</span><span class="cl"><span class="c1">#14 [ffff800008413fe0] el0t_64_sync at ffffd6678e811de4</span>
</span></span><span class="line"><span class="ln">18</span><span class="cl">     PC: 0000ffffb540c450   LR: 0000aaaad6f36968   SP: 0000fffff1d1fe50
</span></span><span class="line"><span class="ln">19</span><span class="cl">    X29: 0000fffff1d1fe50  X28: 0000aaaaf5de4700  X27: <span class="m">0000000000000000</span>
</span></span><span class="line"><span class="ln">20</span><span class="cl">    X26: 0000aaaaf5de46e0  X25: <span class="m">0000000000000020</span>  X24: 0000fffff1d1ff20
</span></span><span class="line"><span class="ln">21</span><span class="cl">    X23: <span class="m">0000000000000001</span>  X22: 0000ffffb55527a0  X21: <span class="m">0000000000000002</span>
</span></span><span class="line"><span class="ln">22</span><span class="cl">    X20: 0000aaaaf5deb100  X19: <span class="m">0000000000000001</span>  X18: <span class="m">0000000000000001</span>
</span></span><span class="line"><span class="ln">23</span><span class="cl">    X17: 0000ffffb540c420  X16: 0000aaaad6ff1948  X15: 65645f34366d7261
</span></span><span class="line"><span class="ln">24</span><span class="cl">    X14: <span class="m">0000000000000001</span>  X13: <span class="m">0072656767697274</span>  X12: 2d71727379732f63
</span></span><span class="line"><span class="ln">25</span><span class="cl">    X11: 2f686372612f6769  X10: <span class="m">0000000000000000</span>   X9: <span class="m">0000000000000020</span>
</span></span><span class="line"><span class="ln">26</span><span class="cl">     X8: <span class="m">0000000000000040</span>   X7: 7f7f7f7f7f7f7f7f   X6: <span class="m">0000000000000063</span>
</span></span><span class="line"><span class="ln">27</span><span class="cl">     X5: fffffffffffffffe   X4: <span class="m">0000000000000001</span>   X3: 0000ffffb5552010
</span></span><span class="line"><span class="ln">28</span><span class="cl">     X2: <span class="m">0000000000000002</span>   X1: 0000aaaaf5deb100   X0: <span class="m">0000000000000001</span>
</span></span><span class="line"><span class="ln">29</span><span class="cl">    ORIG_X0: <span class="m">0000000000000001</span>  SYSCALLNO: <span class="m">40</span>  PSTATE: <span class="m">80000000</span>
</span></span></code></pre></div>
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